Got invitation to USA, but, not enough funds. Shall I ask for donations?

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well, friends,.. I am not ASKING YOU for money. My question is.. shall I ask online, through a website, which is FREE to host, with a FREE DOMAIN name too, ofcourse, for DONATIONS. i am having good qualifications, and have been invited to speak in an international forum on HEALTH. And, it is a good chance for me to prove that ALTERNATIVE THERAPIES far surpass the chemical drugging system of treatment, more commonly called ALLOPATHY. The trouble is, I dont have adequate funds to travel, and stay at the United States of America. Should I ask for donations?